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Range DescriptionAotus vociferans occurs north of the Rio Amazonas-SolomÃµes, west from the Rio Negro. It occurs south of the Rio SolimÃµes in a small incursion either side of the mouth and lowermost reaches of the Rio Purus. West it extends into Peru north of the RÃo Amazonas and MaraÃ±Ã³n, not extending it would seem right to the Rio MaraÃ±Ã³n, with a narrow belt along the north of the river being occupied by A. nancymaae (Aquino and EncarnaciÃ³n 1994a). It extends north through the Ecuadorian Amazon into Colombia to the RÃo Guaviare, probably extending east as far the rÃos Negro, Atabapo and Orinoco (HernÃ¡ndez-Camacho and Cooper 1976; Defler 2003, 2004).